[Ffmpeg-devel] int vs. float: Hard Numbers
Sat May 21 00:15:02 CEST 2005
On Fri, 20 May 2005, Rich Felker wrote:
> Yes, Intel sucks. Try it on AMD. FYI, test results I recently saw on
> #mplayerdev or one of the mailing lists (can't remember which right
> off) showed P4 taking 4x as many cycles to perform common codec
> operations as an Athlon took.
That was me, in #mplayerdev.
On a AMD Barton 1.8GHz:
428 dezicycles in h264_v_loop_filter_chroma_intra_mmx2, 1048576 runs
On a P4 2.3GHz:
1775 dezicycles in h264_v_loop_filter_chroma_intra_mmx2, 1048576 runs
That function has a couple of memory accesses, and is otherwise pure
mmx 8-bit math.
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